Re-roofing Benefits
Author : johnson roofers | Published On : 18 Oct 2026
We believe property owners should understand what their roof needs and why. Our familiarity with area permitting and roofing standards helps projects move forward correctly and efficiently. The goal is to make roofs strong, safe, and reliable so families can feel protected under their roof every day. Roofing is a roofing company that helps people take care of the roofs on homes and buildings. In some cases, local building codes will limit the available options—most do not allow more than two roof coverings on a building. However, there is no easy, universal answer if only one roof is in place. Although in many cases it is not necessary to tear off old shingles before installing new shingles, some roofing professionals will insist on replacement because it ensures that a completely new roofing system is installed - Roofing Contractors.
In some cases, local building codes will limit the available options. Generally, most do not allow more than two roof coverings on a building. In many cases, it is not necessary to tear off old shingles before installing new shingles. However, in some cases, conditions necessitate roof replacement. The benefits of replacement include having the opportunity to inspect the roof deck, repair any damage, and improve deck attachment to the underlying structure. Each roof must be evaluated individually. General guidelines can facilitate an informed decision on whether to replace or recover an existing asphalt shingle roof. Note: some asphalt shingle designs do not lend themselves to recovering. For example, most manufacturers do not recommend installing new shingles over existing laminated shingles - Roofing projects.
Consult the shingle manufacturer for specific recommendations. These guidelines include but are not limited to the following: Confirm that local building codes permit the installation of an additional layer of shingles. Make sure the structure beneath the roof deck has sufficient capacity to bear the weight of another layer of shingles. Ensure the roof deck remains structurally sound and allows for adequate fastener retention. If a roof has only one layer of shingles that lies flat and the deck is in good condition, replacement may not be necessary. Not only will the existing layer provide a secondary backup roof for the new shingles, but it will also save the cost and inconvenience of removing and recycling or disposing of the old shingles. The existing roof has two layers of shingles. Note: local building codes may define the number of permissible layers. The roof structure shows signs of sagging across the ridge or truss lines. If the roof does not look straight and does not feel solid, have the structure inspected by a licensed structural engineer to check for structural defects. For more information, please visit our site https://johnsonroofingltd.co.nz/
